BOTH INTERNATIONAL & INLAND You are approaching another vessel at night. You can see both red and green sidelights and, above the level of the sidelights, three white lights in a vertical line. Which vessel is required to have these lights?

Correct Answer: Option D — a vessel towing a tow more than 200 meters astern

Rule 24(a) dictates that a power-driven vessel towing astern with a tow exceeding 200 meters must display three masthead lights in a vertical line. The presence of sidelights confirms the vessel is underway, while the three masthead lights specifically signify the length of the tow exceeds 200 meters.